Waves

Slinky Waves A wave is caused by a vibrating source, and travels outwards from the source. The particles of the medium through which a wave travels move about their equilibrium positions; they do not move along with the wave. Energy is transferred from place to place by a wave.

To think about ,[object Object],[object Object],[object Object],[object Object],[object Object]

What you are going to achieve today ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Phase Dual pendulums to demo phase

V = f λ ,[object Object],[object Object],[object Object],λ c = f λ is used for electromagnetic waves as the velocity of light is always 3 x 10 8 m/s

Speed, wavelength and frequency ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The speed of sound in air 330 m/s speed of light 3 x 10 8 m/s. s = v ∆ t

Answers ,[object Object],[object Object],6) s = v ∆ t = 330 x 1.5 = 495 m, light transit time is negligible

Polarisation Polarisation can only happen with transverse waves http://www.youtube.com/watch?v=qlRriWu1zOI&feature=related http://www.youtube.com/watch?v=ozTH2zIKwC0&feature=player_embedded

The water tubs waves in another medium ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

CHALLENGE! Demonstrate longitudinal and transverse waves In a group of 5 demo both types of wave

Waves

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Waves